US Bridges

M-64 over Sleepy Creek

Fair

Ontonagon County, Michigan · 4.5 MI N of M-28 · Structure no. 000000000008463

Built
1960
65 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
44 ft
1 main span
Daily traffic
743
2022 count
Owner
State
State Highway Agency

About this bridge

M-64 over Sleepy Creek is a steel stringer/multi-beam or girder carrying M-64 over Sleepy Creek in Ontonagon County, Michigan. It was built in 1960, so it is 65 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 743 vehicles a day, roughly 33% of them trucks. The structure is 44 ft (13.3 m) long and 45 ft wide. If it were closed, the detour would be 54.1 mi (87 km).

Location

Open in Google Maps
CarriesM-64
CrossesSleepy Creek
Location4.5 MI N of M-28
RouteState Highway 64
CountyOntonagon County
StateMichigan
Coordinates46.65306, -89.59791
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating82.9 US tons
Inventory rating49.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length44 ft (13.3 m)
Longest span43 ft (13 m)
Deck width45 ft (13.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic743 (2022)
Projected traffic—
Trucks33%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed54.1 mi (87 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was M-64 over Sleepy Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is M-64 over Sleepy Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2024.

How much traffic does M-64 over Sleepy Creek carry?

About 743 vehicles per day (2022 count), of which roughly 33% are trucks.

How long is M-64 over Sleepy Creek?

The structure is 44 ft (13.3 m) long with a longest span of 43 ft (13 m) and a deck 45 ft wide.

Who owns M-64 over Sleepy Creek?

It is owned by the State Highway Agency.